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Method for preparing active carbon from pulping paper mill sludge

A technology for preparing activated carbon and paper mills, which is applied in the field of sludge treatment and utilization in pulp and paper mills. It can solve problems affecting the preparation of activated carbon and product effects, and achieve low cost, low energy consumption, and less pollution.

Inactive Publication Date: 2009-03-25
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the composition of papermaking sludge is different from that of municipal sludge, the main components of papermaking sludge are cellulose and ash. In addition, it also contains fillers, coagulants and other pollutants. These compositions will seriously affect the preparation of activated carbon and the product effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take the pulp mill sludge and put it in an oven to dry to constant weight, then crush it after cooling, screen out the particles smaller than 5mm, and then add 2mol / L ZnCl 2 solution. Sludge and ZnCl 2 The mass ratio of the solution is 1:2.5. After soaking at room temperature for 48 hours, the liquid is centrifuged and dried to constant weight. The treated sludge is heated to 400°C in a pyrolysis furnace for carbonization activation. The activation time is 60 minutes, and the heating rate is 40°C / min. After the product is cooled, it is impregnated with 10% HCl solution and 10% NaOH solution at room temperature for 2 hours, rinsed with distilled water until neutral, and finally dried to obtain activated carbon.

[0016] The BET surface area of ​​the prepared activated carbon is 541.7m 2 g -1 . Its adsorption characteristics are: the average removal rate of phenol is 60.5%.

Embodiment 2

[0018] Take the pulp mill sludge and put it in an oven to dry to constant weight, then crush it after cooling, screen out the particles smaller than 5mm, and then add 4mol / L ZnCl 2 solution, sludge and ZnCl 2 The mass ratio of the solution is 1:4. After soaking at room temperature for 12 hours, the liquid is centrifuged and dried to constant weight. The treated sludge is heated to 700°C in a pyrolysis furnace for carbonization activation. The activation time is 30 minutes, and the heating rate is After the product is cooled, it is impregnated with 20% HCl solution and 10% NaOH solution at room temperature for 4 hours, rinsed with distilled water until neutral, and finally dried to obtain activated carbon.

[0019] The BET surface area of ​​the prepared activated carbon is 674.8m 2 g -1 . Its adsorption characteristics are: the average removal rate of phenol is 68.5%.

Embodiment 3

[0021] Take the pulp mill sludge and put it in an oven to dry to constant weight, then crush it after cooling, screen out the particles smaller than 5mm, and then add 5mol / L H 2 SO 4 solution, sludge and H 2 SO 4 The mass ratio of the solution is 1:3. After soaking at room temperature for 24 hours, the liquid is centrifuged and dried to constant weight. The treated sludge is heated to 550°C in a pyrolysis furnace for carbonization activation. The activation time is 30 minutes, and the heating rate is After the product is cooled, it is soaked with 20% NaOH solution for 3 hours at room temperature, rinsed with distilled water until neutral, and finally dried to obtain activated carbon.

[0022] The BET surface area of ​​the prepared activated carbon is 512.5m 2 g -1 . Its adsorption characteristics are: the average removal rate of phenol is 56.8%.

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Abstract

The invention relates to a method for preparing active carbon by sludge in a pulp and paper mill. The method comprises the following steps: after being dried, crushed and screened, the sludge is impregnated and dried with the solution of zinc chloride, sulphuric acid or phosphoric acid; later the treated sludge is put into a pyrolysis furnace and activated for 10 to 90min under anoxic condition when the temperature is increased to 400 to 700 DEG C, with the heating rate of 10 to 40 DEG C per min; and when the activated product is cooled, through the impregnation of HCl and / or NaOH solution, the rinse and dry of distilled water, the active carbon is obtained. The method has simple process flow, low energy consumption, less pollution, low cost, wider mesopore and micropore distribution as well as larger pore volume of the active carbon, shows good adsorption property in the aspect of sewage treatment, and provides an optional new channel for the resource utilization of the sludge in the pulp and paper mill.

Description

technical field [0001] The invention relates to the treatment and utilization of pulp and paper mill sludge, in particular to a method for preparing activated carbon by using pulp and paper mill sludge. Background technique [0002] During the pulp and paper mill wastewater treatment process, a large amount of sludge will be produced, and its components are generally: fine fibers, lignin and its derivatives, and some organic substances, and also contain a large number of pathogens, parasite eggs, and copper, arsenic, Lead, zinc, aluminum, mercury and other heavy metals and refractory organic pollutants and other harmful components. It is estimated that about 20 million tons of papermaking sludge was produced nationwide in 2006. The treatment and disposal of papermaking sludge as solid waste has always been a difficult problem for pulp and paper companies. At present, the treatment methods of papermaking sludge include throwing into the sea, landfilling, land utilization, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 王景全孙全民胡湛波张大磊刘世锋孔海南
Owner GUANGXI UNIV
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